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Magnetic flux through a coil of resistance $10 \Omega$ is changed by $\Delta \phi$ in $0.1 \mathrm{~s}$. The resulting current in the coil varies with time as shown in the figure. Then $|\Delta \phi|$ is equal to (in weber)
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2
2
$$
\text { As } \begin{aligned}
e=\frac{\Delta \phi}{\Delta t} & \text { or } R i=\frac{\Delta \phi}{\Delta t} \quad(\because e=R i) \\
\Rightarrow \quad \Delta \phi & =R(i . \Delta t) \\
& =R \times \text { area under } i-t \text { graph } \\
= & 10 \times \frac{1}{2} \times 4 \times 0.1=2 \text { weber }
\end{aligned}
$$
\text { As } \begin{aligned}
e=\frac{\Delta \phi}{\Delta t} & \text { or } R i=\frac{\Delta \phi}{\Delta t} \quad(\because e=R i) \\
\Rightarrow \quad \Delta \phi & =R(i . \Delta t) \\
& =R \times \text { area under } i-t \text { graph } \\
= & 10 \times \frac{1}{2} \times 4 \times 0.1=2 \text { weber }
\end{aligned}
$$
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